ICD-10-CM > M00-M99 > M05-M14 > M12 > M12.4 > M12.42 M12.42 Intermittent hydrarthrosis, elbow Non-Billable/Non-Specific Codes M12.421Intermittent hydrarthrosis, right elbowM12.422Intermittent hydrarthrosis, left elbowM12.429Intermittent hydrarthrosis, unspecified elbow